Make it safe to call SSL_library_init more than once.

We are basically admitting that pthread is everywhere, and
we will be using it for other things too.
ok jsing@

1 files changed, 12 insertions, 5 deletions

diff --git a/src/lib/libssl/ssl_algs.c b/src/lib/libssl/ssl_algs.c
index efbf1a4f31..ab88b29cc1 100644
--- a/src/lib/libssl/ssl_algs.c
+++ b/src/lib/libssl/ssl_algs.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssl_algs.c,v 1.24 2017/03/01 14:01:24 jsing Exp $ */
+/* $OpenBSD: ssl_algs.c,v 1.25 2017/04/29 21:54:54 beck Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -60,13 +60,15 @@
 
 #include <openssl/lhash.h>
 #include <openssl/objects.h>
+#include <pthread.h>
 
 #include "ssl_locl.h"
 
-int
-SSL_library_init(void)
-{
+pthread_once_t SSL_library_init_once = PTHREAD_ONCE_INIT;
 
+static void
+SSL_library_init_internal(void)
+{
 #ifndef OPENSSL_NO_DES
         EVP_add_cipher(EVP_des_cbc());
         EVP_add_cipher(EVP_des_ede3_cbc());
@@ -125,6 +127,11 @@ SSL_library_init(void)
 #endif
         /* initialize cipher/digest methods table */
         ssl_load_ciphers();
-        return (1);
 }
 
+int
+SSL_library_init(void)
+{
+        pthread_once(&SSL_library_init_once, SSL_library_init_internal);
+        return 1;
+}